Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d74c0ebf7c3d38…

MALICIOUS

PDF

81.5 KB Created: 2021-02-21 03:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c301be1485b727f0e96caa19856d9378 SHA-1: 008109878eff310e64692816a1e7620b601caca0 SHA-256: d5d74c0ebf7c3d38bbf8003918f9a1b45ae9930ac957b02750a6bb66abdd93e8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a focus on driving traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=western+gun+fighting+games PDF link annotation
    • https://cdn.sqhk.co/movumatoz/6givKgd/6450842156.pdfIn PDF document text
    • http://save50it.pro/million_reason_piano_sheet_musicibajp.pdfIn PDF document text
    • http://lazerepil.site/kivufuninapanejc8ag.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/dff4f3b.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/egfgjgh/necromancer_build_diablo_3.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/idzYhcC/eisenhower_tunnel_colorado.pdfIn PDF document text
    • http://bonboxstudio.com/taps_to_riches_twentieth_franchisetjguc.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/ihKgchb/rope_around_the_earth_add_1_meter.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/j6Ygi8n/duck_hunt_game_console.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/6JWJheh/arkade_blaster_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/YhfteqW/kujakegifigipafutibasod.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/nE3gjUm/free_download_crazy_taxi_classic_pc_game.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/Thi0Vhg/dojepofum.pdfIn PDF document text
    • http://visezuxopusifik.iblogger.org/beacon_academy_grimsby_uniform.pdfIn PDF document text
    • http://itfamily.pro/aatma_bandhuvu_movie_songs_frees97mi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kovilowab/50576118420.pdfIn PDF document text
    • http://vovajixavago.epizy.com/hq_trivia_questions_and_answers_twitter.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/kurago.pdfIn PDF document text
    • http://dakinopelijanup.rf.gd/mamimamufini.pdfIn PDF document text
    • http://vipowiso.epizy.com/cgfns_credential_evaluation_report.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 5160 bytes
SHA-256: 5d9859432dbe85019cae9aa7e5723bd03f96a2fa31e1cb836d54d5b4477dcec6
font_01_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 10672 bytes
SHA-256: 47e4f2ff5e3a5dfb79507f079f3a00da9d9b0242f69cb4210477965ddefb53c9

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